77908122493 has 2 divisors, whose sum is σ = 77908122494. Its totient is φ = 77908122492.

The previous prime is 77908122473. The next prime is 77908122541. The reversal of 77908122493 is 39422180977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77753418649 + 154703844 = 278843^2 + 12438^2 .

It is a cyclic number.

It is not a de Polignac number, because 77908122493 - 2⁹ = 77908121981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77908122493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77908122473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38954061246 + 38954061247.

It is an arithmetic number, because the mean of its divisors is an integer number (38954061247).

Almost surely, 2^77908122493 is an apocalyptic number.

It is an amenable number.

77908122493 is a deficient number, since it is larger than the sum of its proper divisors (1).

77908122493 is an equidigital number, since it uses as much as digits as its factorization.

77908122493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 77908122493 in words is "seventy-seven billion, nine hundred eight million, one hundred twenty-two thousand, four hundred ninety-three".